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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b655b305254d75b8c88cc1c886e4aa43f5042f913b5b86901c521a0787ae7d24' 
  AND token = 'y8Dv9t/LUWwuE2LdUcmVwamYyqoM3udd36xU+2wX9SM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}